@LittleMermaidRose have a look at the NHS Diabetes Prevention Programme (DPP) - https://www.england.nhs.uk/diabetes/diabetes-prevention. The NHS is putting a lot of resources into stopping us at the pre-diabetes stage so that we don't proceed to getting actual diabetes.
My pre-diabetes was picked up in a routine blood test, and the GP surgery referred my to the programme. Here's how it worked for me:
Xyla Health (the local provider in my area) contacted me by text, giving me a link to the website where I could choose how to be on the programme - either face-to-face (group meetings) or digitally. I chose face-to-face, and picked the most convenient group to join.
You start with a telephone assessment, takes about half an hour to go through. They're asking the obvious questions about what your general diet is, your exercise, weight etc. This establishes a baseline for them.
I then started the programme proper about a fortnight later , at the group I had picked as being the most convenient for me to get to.
The programme consists of 14 sessions, always at the same time, same day of the week, same location. If for any reason you cannot make one of the sessions they are happy for you to attend that session digitally, or at another location.
The first six sessions are spaced fortnightly, then it moves to 4-weekly. This gives you the chance to implement what you've taken from each session for long enough to find what works best for you, which you can then feed back to the person running your sessions. It is definitely not a quick fix; the aim is that over the course of the 9 months your sessions run, you will be able to make the lifestyle changes necessary and for these changes to become habit.
Each session covers a different aspect that might be leading you towards diabetes - it's not all about the diet! I've completed eight of the sessions now, the most recent one was about sleep (poor sleep raises the cortisol in your bloodstream which can increase insulin resistance). There's also been sessions on stress, on how to read the labels on food packaging to identify what could be a contributing factor, exercise, what triggers you to eat, how to identify what could be stopping you from changing your diet, etc.
I personally have found these sessions very helpful. I already knew a lot about nutrition and what I SHOULD be doing, but I've not been very good at actually DOING. This has helped me to identify my weak spots and suggest strategies to bolster it. Plus there's the whole group thing, all in it together, cameraderie, different people asking different questions that you wouldn't have thought to ask but you're glad of the answer.
There were about 20 people at the start, I'd say 50:50 male:female, mostly middle-aged and overweight but some surprisingly young and apparently slim and fit. There's about 15 people still there at the half-way point; I believe two transferred to more convenient locations and two dropped out.
Although I was referred to the programme by my GP surgery, I think you may be able to self-refer too.